方位向非均匀采样对多通道天线星载SAR成像性能的影响

方位向周期性非均匀采样是多通道天线星载SAR系统设计时需要考虑的一个重要因素。针对多通道天线星载SAR系统中存在的方位向周期性非均匀采样对成像性能的影响进行了分析。在建立多通道天线星载SAR回波信号模型的基础上,根据成对回波理论和匹配滤波原理推导了由方位向周期性非均匀采样所造成的虚假目标位置与强度的计算公式,并结合成像处理过程分析了二维成像处理算法对虚假目标的影响,给出了二维成像处理后所得到的虚假目标强度计算公式。最后,通过计算机仿真验证推导与分析的正确性。

Effect of the Recurrent Non-uniform Sampling in the Azimuth Direction on Multi-channel Antenna Space-borne SAR Imaging Performance

One of the most important factors needed to be considered when designing the space-borne synthetic aperture radar(SAR) system with multi-channel antenna is the recurrent non-uniform sampling in the azimuth direction.Based on the echo signal model of the space-borne SAR system with multi-channel antenna and paired-echo theory,formulae about the positions and intensities of the false targets were deduced,which were derived from the recurrent non-uniform sampling in the azimuth direction.Furthermore,the influences of the two-dimensional imaging process on the false targets were analyzed and the intensities of the false targets being processed were given.The result of computer simulation proves the validity of the content.